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    Re: checking the magnetic compass
    From: Byron Franklin
    Date: 2009 Sep 24, 14:56 -0700

    I have been out of the Navy sime 1978 but because of my input  to
    Bowditch and other Publication I have been close to Surface Warfare
    School in Newport and recently have gave opinion on new Ship
    Equipment. As a former Nuclear Sub crew I have a lot of the electronic
    background.
     Of course I do not have a NAV REG. BOOK. But In 2005 I was given a
    copied of the Instruction that Surface Warfare teaches. The number of
    times this instruction talk about the Standard Magnetic Compass would
    be to much to write about.  So I must write in General. Under
    Navigation Bill.
    Frequent comparison of the Master Compass and the Magnetic. He/She
    will train for and practice alternate methods of determine gyro error.
    Further on, adjust for and compensate the Magnetic Compass per
    required PMS.  prepare a table of deviation making sure that copies
    are posted, CONN and Plotting stations. During restricted water
    transits, �adjust� the switch of the aux compass will be turned off
    and the heading display will only be Magnetic Compass, ensuring,
    Compass comparing between the bridge gyro repeater and the Magnetic
    compass is made every half hour and ever course change and recorded in
    the compass log.  Gyro Casualty use the Magnetic Compass for steering
    � It goes on about Flux Gate and Degaussing. Much more about the use
    of the Magnetic Compass �. That should give you an idea about
    dependable trustworthy.  The Navy has the manpower to go the extra
    checks and precaution. They cannot have the grounding of capitol and
    nuclear ships. They must be over cautious.Navy Grounding are big new,
    other ships are news only if they drop oil ect.
    As for time, Intrepid used the Magnetic Compass as steering Compass,
    we made no problem of shifting over, the helms man was well trained
    the compass log had the magnetic course as required and it was noted
    in the log. I was aboard 5 years with, every year, 6 to 10 month trips
    to the Baltic, North Atlantic, and Med and back to US amoung in
    between up and down the coast.  So when did gyro go down and steering
    by compass? It is in the �Intrepid bridge log�
    
    
    On Sep 23, 8:39�pm, Anabasi...---.com wrote:
    > This is still the practice on merchant ships. �We look through our �
    > periscope to the magnetic compass on the flying bridge and we have two course �
    > "boards" on the forward bridge bulkhead, one for magnetic, one for gyro. � They
    > are checked periodically, but I won't go so far as to say "one an hour" or �
    > anything, but it is still common practice. �I check them personally several �
    > times each watch. �
    >
    > One ship I know of sailed from the US Gulf to East Africa with no gyro �
    > (hand steering using the magnetic compass) last year. �That isn't quite �
    > "kosher" these days, but it can still happen. �There are some steering �stations
    > that can even use the auto pilot via magnetic compass. �Ours is �supposed to
    > be able to steer via magnetic compass, but that function hasn't �worked in
    > many years.
    >
    > There is a regulation somewhere that requires a compass deviation card to �
    > be created at least annually. �We also try to determine magnetic deviation �
    > once a watch via Azimuth/amplitude.
    >
    > The magnetic compass isn't quite dead on the big ships! �;-)
    >
    > Jeremy
    >
    > In a message dated 9/23/2009 4:06:34 A.M. Eastern Daylight Time, �
    >
    > frankr...{at}HistoricalAtlas.com writes:
    > You �wrote:
    >
    > "the magnetic compass on board is called " the standard compass" �every
    > half hour and every change of course regulations require a compass check �
    > between the gyro and the magnetic."
    >
    > When were such checks required by �regulation? When was the last decade in
    > which this was common practice �(whether formally required by paper
    > regulation or not)?
    >
    > "On the �Intrepid, I do remenber loosing gyro and steering the standard."
    >
    > When �was �that??
    >
    > -FER
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